Good answer... It looks like it would take on the order of 7 CPU years to create a table of every used address, much less time to target an area or individual.
I don't think this is an issue at all though, I was just curious.
Actually, the salting is an important detail. Those 7 CPU years would only create a table for one hash. That's how long it takes to brute force a single hash, not the entire space.
